Finding the Fourth Proportional to 21,919.69, 30,249.17 and 12,488.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,919.69 : 30,249.17 = 12,488.25 : x
2. Step 2: Convert to fraction form
   21,919.69/30,249.17 = 12,488.25/x
3. Step 3: Cross multiply
   21,919.69x = 30,249.17 × 12,488.25
4. Step 4: Simplify right side
   21,919.69x = 377,759,228.47
5. Step 5: Solve for x
   x = 377,759,228.47/21,919.69
6. Step 6: Final answer
   x = 17,233.79